process by which radiation is returned by a surface or a medium, without change of frequency of its monochromatic components

NOTE 1 Part of the radiation falling on a medium is reflected at the surface of the medium ("surface reflection"); another part may be scattered back from the interior of the medium ("volume reflection").

NOTE 2 The frequency is unchanged only if there is no Doppler effect due to the motion of the materials from which the radiation is returned.

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